I seam to be having problems importing morph targets when they are in separate files.
Do they need to be “skinned”, do you include the skeleton in each morph target file ?
Some clues please 
W Jones
Can you even do this ?
The documentation seams to imply you can, and shows a folder where the names of different animations are shown, however if I try to load two morphs from two files I end up with two meshes in the editor rather than one mesh with two morphs ! The two files both contain a “base” mesh with the same name, then 2 different morphs with different names.